Chemistry 0620 · IGCSE · Elements, compounds and mixtures
Elements, compounds and mixtures — practice question
Below are the symbols and formulae for some elements and compounds.
Ar Ca(OH)$_2$ Cl$_2$ CO$_2$ Cu Fe SO$_2$ V$_2$O$_5$
Use only the elements or compounds in the list to answer the questions that follow. Each item may be chosen once, more than once, or not at all.
State which element or compound is used:
(a)[1]
for killing bacteria in drinking water
(b)[1]
for use as a food preservative
(c)[1]
for use as an electrical conductor in cables
(d)[1]
as an inert atmosphere inside lamps
(e)[1]
to remove excess acidity from soil
(f)[1]
for use as a catalyst in the Contact process
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Cl₂, or chlorine” …